Atlas Resource Partners, L.P. operates as an independent developer and producer of natural gas, crude oil, and natural gas liquids in the United States. The company operates in three segments: Gas and Oil Production, Well Construction and Completion, and Other Partnership Management. As of May 18, 2015, it owned interest in approximately 14,000 producing natural gas and oil wells located primarily in Appalachia, the Barnett Shale and the Eagle Ford Shale (Texas), the Mississippi Lime (Oklahoma), the Raton Basin (New Mexico), Black Warrior Basin (Alabama), and the Rangely Field (Colorado). The company had estimated proved reserves of 1,429 billion cubic feet equivalent. In addition, it sponsors and manages tax-advantaged investment natural gas and oil partnerships. The company was founded in 2011 and is based in Pittsburgh, Pennsylvania.